Water backing up from sump pump

The sump pump installed 2 years ago is found to malfunction. During downpour, I
can see water receding back all over the basement… When does this happen?
Should I go for a complete replacement of the sump pump?

replying to SusanneX10, Iggy wrote:
Not necessarily. The Pump may be blocked on its underside or inlet, the Check
Valve may have been installed backwards or the drain pipe may be clogged inside
or outside. Call a plumber in to assess the pump and sump and entire
installation. Any repairs are extremely easy to test immediately for full and
proper operation.

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